Method of making valve seat rings



June 1933- sIA. STRICKLAND 1314179 METHOD OF MAKING VALVE SEAT RINGS Filed March 14, 1932 i f i i J I INVENTOR F N l i S/hSflSfr/M/Q Qj E06: BY 4/ ATTORNEYS Patented June 13, 1933 p i V UNITED STATES PATENT "OFFICE SILAS A. STRICKLAND, OF DETROIT, MICHIGAN METHOD OF MAKING VALVE SEAT RINGS Application filed March 14, 1932. Serial N0. 598,719.

This invention relates to methods of mak of the element and the lower portion is a ing renewable valve seat rings used particucross section of the same on the line 2-2. larly in internal combustion engines. Fig. 3 shows two elements of the form Renewable valve seat rings, as used in inof Fig. 2 placed in juxtaposition and ready 5 ternal combustion engines, are often made of for joining;

a high grade metal, one which resists 'pitw Fig. I shows two elements joined; ting and corrosion, and because such metals Fig. 5 shows in cross section and in top are relatively expensive and hard to maplan View a valve seat ring'blank; and chine, the rings are also relatively costly. Fig. 6 shows, in cross section, a finished Sometimes in order to reduce costs, lower valve seat ring in use in an internal comgrade material such as cast iron, is used for bustion engine. the rings, but without satisfaction for cast In making the ring blank, a plurality of iron does not resist pitting and corrosion blank elements arejoined to form a ring. effectively. These elements may be cut from a coil of It therefore appears desirable to provide the material, or from straight lengths of the a novel method of making such rings, a same. The natureof the supply stock, in method which will be so economical as to this respect, is immaterial. It is preferred, permit the use of high grade and expensive and considered desirable, to have the'stock materials, in competition to cheaper maof the cross section of the ring blank, in 20 terials. The novel method reduces costs by order to eliminatethe necessity of machineliminating waste and expensive machining or otherwise processing the blank eleing in the formation of the blanks from ments during their manufacture. which the ring may be made, and is the In Fig. 1, the blank element 10 is shown principal object of the invention. in the form of a straight length, having a 2:, In making valve seat rings, by the method cross section like that of the ring blank and of the invention, it is first contemplated to having a length slightly greater thanthat of make a ring blank, so shaped and dimenone half the ring blank. Two of these blank sioned, as to require no machining or procelements are used, and, theirv aggregate essing, other than finish-grinding, in order length is slightly greater than the circumso for it to be transformed into a completely ference of the ring blank. finished valve seat ring. Various methods In the method of the invention the blank of making such blanks may be suggested, element 10 is first formed into an arc of but all heretofore known, require considerthe radius B. This radius being equal to able machining and cause great waste of the that of the ring blank. Since the blank elematerial employed. In the method of the ment 10 is more than a semi-circle in length, invention, wherein arcuate pieces are first ends 12 thereof will projectbeyond the diformed, and are then joined in a manner to ametrical line 22 traversing the blank eleform a ring of the proper shape and diment; mensions, very little machining is required Two elements of the form of Fig. 2 are 4c and but little waste is caused. then placed in juxtaposition, as ,in Fig. 3, The invention will be readily understood and are then joined, preferablyby welding, by those skilled in the art upon reference to form the ring of Fig. 4. While the eleto the following description and the acments are being welded to each other, they companying drawing in which, are moved towards each other so asto lessen 45 Figure 1 shows a straight elongated blank their aggregate length and to make the same element, from a plurality of which a ring equal to the circumference of the ring blank,

blank may be made; thus causing the latter to become a perfect Fig. 2 shows the element of Fig. 1 in an circle, with a diameter equal to 2 R, the intermediate stage of manufacture; the updesired diameter.

50 per portion of this figure is a top plan View The surplus metal, indicated at X, is then.

trimmed off, in any suitable manner, to form a ring blank, from which a finished valve seat ring may be made, merely by grinding to size.

While the drawing shows two blank elements, each in the form of a semi-circle, joined to form a ring blank, it will be understood that three or more arcuate blank elements may be used. The aggregate length of the elements being used should be slightly greater than the desired circumference of the ring blank, the cross section of the elements should be the same as that of ring blank, and the radii of the arcs of the elements should be the same as that of the ring blank.

It will be seen that there is substantially no waste of metal, no expensive and laborious machining and very little grinding necessary when ring blanks are made by the method of the invention. It will fur ther be seen that a ring blank made by the method of the invention, though initially of separate pieces, is in its finished form a one piece or integral article of manufacture and structurally does not differ from ring blanks made by other methods.

It will further be seen that due to the .elimination of waste, expensive machining operations, etc., a ring blank can be made by the method of invention at a far lower cost than is possible with other methods of manufacture.

Now having described the invention it is to be understood that the same is to be limited, not to the specific method herein set forth, but only by the scope of the appended claim which follows:

What I claim is y In the production of renewable valve seats from high grade material with minimum wastage of material, the method which consists in providing one of the seat structural dimensions by preparing the stock with a cross-section substantially corresponding to the cross-section of the seat, producing from the stock a plurality of arcuate embryo elements each having the radius of the arc corresponding to the finished radius of the seat with the length of the element greater than the lengths of a segment of the proper arcuate length of the element in the complete seat to be formed while maintaining the constancy of such cross-section, assembling the required elements end to end to produce an embryo assembly in which the circular contour has a deformed appearance as compared to the finished seat, welding the assembled elements at the respective end Zones of the elements with the flash internal and external to reduce the arcuate length of the elements to the desired length, and removing the flash to complete the dimensional characteristics of the seat blank, whereby the cross-section of the. seat is completed in adture.

SILAS A. STRICKLAND. 

